The only formal guideline for flavonoid intake recommends 400 to 600 mg per day of flavan-3-ols, a specific subclass found in tea, cocoa, and berries. That recommendation, issued in 2022 by an expert panel from the Academy of Nutrition and Dietetics, is based on moderate evidence for heart and metabolic health benefits. For total flavonoids across all subclasses, there is no single official number, but research consistently links higher and more diverse intake to lower disease risk.
The 400–600 mg Flavan-3-ol Guideline
Flavan-3-ols are the most consumed flavonoid subclass in the American diet, largely because they’re concentrated in tea and chocolate. The 2022 guideline marks the first time any health organization set a daily target for a plant bioactive compound. Unlike vitamin recommendations, it’s not based on preventing a deficiency. Instead, it reflects the dosage range where clinical trials and large observational studies consistently show improvements in blood pressure, cholesterol, and blood sugar regulation.
The average American adult already gets about 192 mg of flavan-3-ols per day, roughly half of the lower target. Total flavonoid intake across all subclasses averages around 345 mg per day, with most of that coming from tea-related compounds. So for many people, closing the gap could be as simple as adding a couple of cups of green or black tea or a serving of dark chocolate.
Targets for Other Flavonoid Subclasses
Beyond flavan-3-ols, no formal daily recommendations exist for other subclasses, but research points to useful ranges.
Anthocyanins, the pigments in berries, red grapes, and purple vegetables, show anti-inflammatory effects at surprisingly low intakes. One large study of U.S. adults found meaningful reductions in inflammatory markers at a median intake of just 32 mg per day. For blood pressure specifically, the benefit appears to peak around 33 mg per day of anthocyanins, with higher doses not offering additional protection. A half-cup of blueberries provides roughly 60 mg, so regular berry consumption easily reaches this range.
Flavonols, found in onions, kale, and apples, were linked to reduced inflammation at intakes around 25 mg per day. That’s achievable from a single serving of onions or a couple of cups of leafy greens.
Diversity Matters as Much as Quantity
A 2025 study of nearly 125,000 UK Biobank participants found that the variety of flavonoids you eat is an independent predictor of health outcomes, separate from how much you consume overall. People who ate the widest range of flavonoid types had a 14% lower risk of death from any cause, a 20% lower risk of type 2 diabetes, a 10% lower risk of cardiovascular disease, and an 8% lower risk of cancer compared to those with the least diverse intake. These associations held even after controlling for total flavonoid quantity.
In practical terms, this means getting your flavonoids from tea alone isn’t as protective as spreading your intake across tea, berries, citrus, onions, leafy greens, and dark chocolate. The researchers found that consuming about 6 to 7 additional flavonoid types per day was the difference between the highest and lowest diversity groups.
Heart and Brain Benefits at Specific Doses
For cardiovascular protection, a meta-analysis of prospective studies estimated a 9% lower risk of stroke for every additional 100 mg of total flavonoids consumed per day. Flavan-3-ol-rich foods specifically lowered blood pressure by about 2.8/2.0 mmHg in clinical trials, with stronger effects in people who already had high blood pressure (reductions of nearly 6/3 mmHg).
Cognitive benefits appear at lower thresholds. A randomized controlled trial found that a daily blueberry serving providing about 19 mg of anthocyanins improved memory and executive function over 90 days. A separate six-month trial using a blueberry extract with just 14 mg of anthocyanins per day also improved episodic memory in older adults. These are small amounts, easily obtained from a modest handful of berries.
Best Food Sources by Serving
Flavonoid content varies enormously between foods. Here are some of the richest common sources per standard serving:
- Green or black tea (1 cup): 100–300 mg of flavan-3-ols, depending on brew time and variety
- Blueberries (½ cup): roughly 60–75 mg, primarily anthocyanins
- Dark chocolate (1 oz, 70%+ cacao): 50–100 mg of flavan-3-ols
- Elderberries (½ cup): over 200 mg of anthocyanins
- Red wine (5 oz glass): about 28 mg of anthocyanins plus additional flavonols
- Strawberries (1 cup): roughly 40 mg of anthocyanins
- Raspberries (½ cup): about 30 mg of anthocyanins
Eggplant skin is exceptionally rich in anthocyanins, and onions are one of the top sources of flavonols. Cocoa beans contain high concentrations of multiple flavonoid types, though processing (especially Dutch processing or alkalization) strips much of the content away.
Why Absorption Varies Between People
Raw intake numbers only tell part of the story. Most flavonoids aren’t absorbed directly in your small intestine. Instead, gut bacteria break them down into smaller compounds that your body can actually use. This means two people eating the same bowl of blueberries may absorb very different amounts depending on their gut microbiome composition.
Your age, overall diet, health status, and even ethnicity influence which bacteria populate your gut and how efficiently they process flavonoids. A diet already rich in fiber and plant foods tends to support the bacterial strains that are best at converting flavonoids into their active forms. In turn, regular flavonoid intake reshapes your gut bacteria in favorable ways, creating a reinforcing cycle.
Supplements vs. Food Sources
No tolerable upper limit has been established for flavonoids from food, and toxicity from dietary sources is not a concern. Supplements are a different story. High-potency flavonoid supplements can deliver doses far beyond what food provides, and at those concentrations, potential problems emerge. Flavonoids can bind to iron and interfere with its absorption, which poses a particular risk for elderly people or anyone with borderline iron status.
The research linking flavonoids to health benefits is overwhelmingly based on food intake, not supplements. Given the importance of diversity, whole foods have a built-in advantage: a cup of tea, a handful of berries, and a square of dark chocolate deliver multiple flavonoid subclasses simultaneously, along with fiber and other compounds that support absorption.